When running OpenGL-Apps like "glxexcess" or games like "Nexiuz", "openarena" or "alienarena" my Club3D Geforce 9500 GT (CGNX-HG952YI) spontaneously blanks the whole screen (DVI) for ~ 1 sec.
This happens ~ 5 times per minute, without any correlation to mouse movement, keyboard events, network traffic or displayed scene complexity.
Sometimes noting happens for one or two minutes, sometimes the blanks "add up" to a black screen for several seconds. This happens at random...

This seems(!) to be the same blank which occurs when starting nvidia-settings the first time. With my old GF8600GT this blank occurred too - but never when running OpenGL apps.

The same (duration) blank occurs when switching the "Force Full GPU Scaling" options in nvidia-settings.

my 9500GT works via DVI nicely with an old phillips lcd monitor, but on my samsung 226bw i get random black screens while playing openGL games. i also tried win7 and got the same problems. the only workaround is connecting via VGA.

is there any chance to get this working, or is this some weird hardware incompatibility?

Got the same problem on my 9600GT.
Also tried many settings like scaling, disabling EDID and second DVI scanning without any success.
UPD: Made a small video showing the issue: http://www.youtube.com/watch?v=qLN9dnzWI2U

Well, it was bearable some time, while playing WoW, but not when watching Starcraft2 cinematics.
It started happening very often on them or when you see the interface between missions(where they used the engine similar to cinematics). Very annoying .

When you play the mission itself or a network game, the flickering is usual - it happens one time in a few minues or even a few tens of minutes.

Is there a way to track this issue - turn on some debug info in wine or driver or maybe mesa? Currently there is still nothing in dmesg, Xorg.0.log or ~/.xsession_errors.